Its easy to call BS due to the fact that if he was really dead on at 0, he would be extremely high out to a very long distance. If he was 2" low at 0, then that would be the +/- 2" or 4" difference he was talking about. My setup seems to be (within my accuracy limitations) about +/-3" to 25ish yards. That is with one pin, I can stay within a 6" circle to about 25 yds.
Are you sure he wasn't using more than one pin?
What was his setup? Mines not special, so maybe with some new speed bow and light arrows...?